I can choose it when I boot up in GRUB. What is it for and what is it used for.
It should give you access to your UEFI firmware settings for your motherboard, where you can usually edit things like processor frequency, RAM timings, boot order etc. This varies a lot between models and manufacturers.
AKA your BIOS.
No problem, glad to help. I find it quite a useful feature with Grub, as without it can be quite difficult to access the UEFI on my laptop (pressing F2) due to how quickly it boots. BIOS (basic input output system) is what to be used for hardware initialisation; pretty much completely replaced with UEFI (unified extensible firmware interface) on modern systems. Some people still refer to UEFI as BIOS as Omano stated.
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